It has to do with failed read/writes of the on board memory. The ECC is constantly monitoring for this situation. If it finds bad read/writes, it will constantly correct and you will notice three things based on severity. Heat, lag, and battery life.

The last time i ran one of the ulowv kernels it actually seemed to drain my battery faster than the lowv version, is that even possible? i going to run a UlowV one again tonight to see what happens.

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Sure, not all CPU are made 100% alike and you could just have one of those CPU that perform better with more voltage. For instance I tried all the ulv kernels and it kept causing my video camera recordings to freeze within a minute of recording forcing me to close the app. Once I changed to a lv kernel, the problem disappeared because I'm no longer starving my phone of the necessary voltage required to run the video camera app.

At work battery life is one of my main requirements so typically i never run my ph faster than 0.8ghz...& the ulv kernel i tried before was the 0.8ghz one, but since i will be home today (so i can charge as needed) i just dropped in the ulv 1.25 kernel just to see what happens.

my battery since i downloaded simply stunning 4.8 from 4.7 and instead of chevys lv1.2 i went with ulv1.2 is very very outstanding now..before i was charging like 4 times a day or so and i stay on my phone all the time...been on for like 5 hours now on and off and only on 90 percent...

I am trying a few different kernels ranging from p3 to chevy and slayher. So far the 1.0 ulv from chevy seems to be giving me the least amount of grief. I will see if I can post some actual data in a few days.

I find myself swapping kernels much more often than even roms...I still have not found one im overall happy with 100% giving me an equal balance of speed & battery life, right now im running jdlfg 1.266 kernel & its one of the snappiest by far.

At work battery life is one of my main requirements so typically i never run my ph faster than 0.8ghz...& the ulv kernel i tried before was the 0.8ghz one, but since i will be home today (so i can charge as needed) i just dropped in the ulv 1.25 kernel just to see what happens.

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You should be able to download and install anywhere. I do.

I don't even make a nandroid.
I use the clockwork path/directory to the download folder on the sdcard and install. If it bootloops hold x and install a different kernal.
Simple as that.